Concept Guide
2 The LBQA will run as a fast poller (typically 1 sec) in failure detection mode.
3 During every fast poll cycle, LBQA will be the rst poller to run.
4 In failure detection mode, the LBQA will issue a single IOCTL for each poll interval, which may in-turn issue multiple LPC operations
(write & read-back) to check the sanity of the LPC bus using the scratch register.
5 The LBQA will use an extended walking 1s/0s test along with a pattern based test (0x00, 0x55, 0xAA, 0xFF) that is staggered across
several polls.
6 The LBQA will limit each sanity check to a maximum of 16 operations (read + write).
7 LBQA will use a variable number of sanity checks over time, it would perform at least 1 check during every poll interval but will perform
8 checks during a signal poll once in 5 seconds.
8 The LBQA can be disabled on a system wide basis (i.e all stack-units or line cards as applicable) through a CLI command.
Restoring the Factory Default Settings
Restoring the factory-default settings deletes the existing NVRAM settings, startup conguration, and all congured settings such as,
stacking or fanout.
To restore the factory default settings, use the restore factory-defaults stack-unit {stack—unit—number | all}
{clear-all | nvram | bootvar} command in EXEC Privilege mode.
CAUTION: There is no undo for this command.
Important Points to Remember
• When you restore all the units in a stack, these units are placed in standalone mode.
• When you restore a single unit in a stack, only that unit is placed in standalone mode. No other units in the stack are aected.
• When you restore the units in standalone mode, the units remain in standalone mode after the restoration.
• After the restore is complete, the units power cycle immediately.
The following example illustrates the restore factory-defaults command to restore the factory default settings.
DellEMC#restore factory-defaults stack-unit 1 nvram
***********************************************************************
* Warning - Restoring factory defaults will delete the existing *
* persistent settings (stacking, fanout, etc.) *
* After restoration the unit(s) will be powercycled immediately. *
* Proceed with caution ! *
***********************************************************************
Proceed with factory settings? Confirm [yes/no]:yes
-- Restore status --
Unit Nvram Config
------------------------
1 Success
Power-cycling the unit(s).
....
Restoring Factory Default Environment Variables
The Boot line determines the location of the image that is used to boot up the chassis after restoring factory default settings. Ideally, these
locations contain valid images, using which the chassis boots up.
When you restore factory-default settings, you can either use a ash boot procedure or a network boot procedure to boot the switch.
Management
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